<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
        <!-- 警告区域 -->
         <el-alert title="注意:只允许为第三级分类设置相关参数" 
                type="warning"  :closable="false" show-icon></el-alert>

        <!-- 选择商品分类区 -->
        <el-row class="cat_opt">
            <el-col>
                <span>选择商品分类：</span>
                <!-- 选择商品级联选择器 -->
                <el-cascader
                    v-model="selectedCateKeys"
                    :options="catelist"
                    :props="cateProps"
                    @change="handleChange">
                </el-cascader>
            </el-col>
        </el-row>

        <!-- 标签页 -->
        <el-tabs v-model="activeName" @tab-click="handleTagClick">
            <!-- 动态参数面板 -->
            <el-tab-pane label="动态参数" name="many">
                <el-button type="primary" size="mini" 
                        :disabled="isBtnDisabled"
                        @click="addDialogVisible = true">添加参数</el-button>
                <!-- 动态参数表格 -->
                <el-table :data="manyTableData" border stripe>
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals" 
                            :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                            <!-- 输入文本框 -->
                            <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)">
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button size="mini" type="primary" icon="el-icon-edit"
                                @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button size="mini" type="danger" icon="el-icon-delete" 
                                @click="removeParamsById(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>

            <!-- 静态属性面板 -->
            <el-tab-pane label="静态属性" name="only">
                <el-button type="primary" size="mini" 
                    :disabled="isBtnDisabled"
                     @click="addDialogVisible = true">添加属性</el-button>
                <!--静态属性表格 -->
                <el-table :data="onlyTableData" border stripe>
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals" 
                            :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                            <!-- 输入文本框 -->
                            <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)">
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button size="mini" type="primary" icon="el-icon-edit"
                                @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button size="mini" type="danger" icon="el-icon-delete" 
                                @click="removeParamsById(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
        </el-tabs>
    </el-card>

    <!-- 添加参数对话框 -->
    <el-dialog
        :title="'添加' + titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDiologClosed">
        <!-- 表单 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="80px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
        <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
    </el-dialog>

    <!-- 编辑参数 -->
    <el-dialog
        :title="'修改' + titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDiologClosed">
        <!-- 表单 -->
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="80px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
        <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
    </el-dialog>
  </div>
</template>

<script>
    export default {
        data(){
            return{
                // 商品分类列表
                catelist:[],
                // 级联选择器的配置对象
                cateProps:{
                  value:'cat_id',
                  label:'cat_name',
                  children:'children',
                  expandTrigger: 'hover'
                },
                // 级联选择框双向绑定到的数组
                selectedCateKeys:[],
                // 被激活页签的名称
                activeName:'many',
                // 动态参数数据
                manyTableData:[],
                // 静态属性数据
                onlyTableData:[],
                // 添加对话框显示与隐藏
                addDialogVisible:false,
                // 添加表单数据对象
                addForm:{},
                // 添加表单验证规则对象
                addFormRules:{
                    attr_name:[
                        { required: true, message: '请输入参数名称', trigger: 'blur' },
                        { min: 2, max: 10, message: '长度在 2 到 10 个字符', trigger: 'blur' }
                    ]
                },
                // 编辑对话框显示与隐藏
                editDialogVisible:false,
                // 编辑表单数据对象
                editForm:{},
                // 编辑表单验证规则对象
                editFormRules:{
                    attr_name:[
                        { required: true, message: '请输入参数名称', trigger: 'blur' },
                        { min: 2, max: 10, message: '长度在 2 到 10 个字符', trigger: 'blur' }
                    ]
                },
                // 控制按钮与文本框的显示与隐藏
                inputVisible:false,
                // 文本框输入的内容
                inputValue:''

            }
        },
        created(){
            // 获取所有商品分类
            this.getCateList()
        },
        methods:{
            // 获取所有商品分类数据
            async getCateList(){
                const {data:res} = await this.$http.get('categories')
                if(res.meta.status !== 200) return this.$message.error('获取商品分类失败 ')
                this.catelist = res.data
            },
            // 级联选择框选中项变化触发这个函数
            handleChange(){
                this.getParamsData()
            },
            // tab页签点击事件的处理函数
            handleTagClick(){
                this.getParamsData()
            },
            // 获取参数列表数据
            async getParamsData(){
                // console.log(this.selectedCateKeys);
                if(this.selectedCateKeys.length !== 3){
                    this.selectedCateKeys = []
                    return
                }
                // 根据所选分类id以及所处面板获取对应参数
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
                if(res.meta.status !== 200) return this.$message.error('获取参数列表失败')

                // 遍历成为数组 不为空进行分割 为空返回空数组
                res.data.forEach(item=>{
                    item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                    // 控制文本框的显示与隐藏
                    item.inputVisible = false
                    // 文本框输入的值
                    item.inputValue = ''
                })
                // console.log(res.data);
                if(this.activeName === 'many'){
                    this.manyTableData = res.data
                }else{
                    this.onlyTableData = res.data
                }

            },
            // 监听添加对话框的关闭事件
            addDiologClosed(){
                this.$refs.addFormRef.resetFields()
            },
            // 添加参数
            addParams(){
                this.$refs.addFormRef.validate(async valid => {
                    if(!valid) return
                    // 可以发起添加参数的网络请求
                    const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                            attr_name:this.addForm.attr_name,
                            attr_sel:this.activeName});
                    if(res.meta.status !== 201) return this.$message.error("添加参数失败！");
                    this.$message.success("添加参数成功");
                    // 隐藏添加用户的对话框
                    this.addDialogVisible = false
                    this.getCateList()
                })
            },
            // 点击按钮 展示对话框
            async showEditDialog(attr_id){
                // 查询当前信息保存到编辑框
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
                {params:{attr_sel:this.activeName}})
                if(res.meta.status !== 200) return this.$message.error('获取参数信息失败')
                this.editForm = res.data
                this.editDialogVisible = true
            },
            // 监听编辑对话框的关闭事件
            editDiologClosed(){
                this.$refs.editFormRef.resetFields()
            },
            // 点击按钮 修改参数
            editParams(){
                this.$refs.editFormRef.validate(async valid => {
                    if(!valid) return
                    // 可以发起修改参数的网络请求
                    const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
                    {attr_name:this.editForm.attr_name,attr_sel:this.activeName})
                    if(res.meta.status !== 200) return this.$message.error("更新参数失败！")
                    // 提示修改成功
                    this.$message.success("更新参数成功")
                    // 更新数据列表
                    this.getCateList()
                    // 关闭对话框
                    this.editDialogVisible = false
                })
            },
            // 根据id删除参数
            async removeParamsById(attrId){
                // 弹窗提示
                const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).catch(err => err)

                // 参数确认删除 返回confirm字符串
                // 参数取消删除 返回cancel字符串
                if(confirmResult !== 'confirm') return this.$message.info('已取消删除')
                const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
                if(res.meta.status !== 200) return this.$message.error("删除参数失败")
                // 更新数据列表
                this.getCateList()
                // 提示删除成功
                this.$message.success("删除参数成功");
            },
            //  文本框失去焦点或者按下enter触发函数 
           async  handleInputConfirm(row){
                if(row.inputValue.trim().length === 0){
                    row.inputValue = ''
                    row.inputVisible = false
                    return
                }
                // 如果没有return 则证明输入了内容 需要后续处理
                row.attr_vals.push(row.inputValue.trim())
                row.inputValue = ''
                row.inputVisible = false
                // 发起请求 保存数据
                this.saveAttrVals(row)

            },
            // 点击按钮 展示文本框
            showInput(row){
                row.inputVisible = true
                // 让文本框自动获取焦点
                // $nextTick 方法的作用，当页面上元素被重新渲染之后，才会指定回调函数中的代码
                this.$nextTick(()=> {
                    this.$refs.saveTagInput.$refs.input.focus();
                });
            },
            // 删除对应的参数项
            handleClose(i,row){
                row.attr_vals.splice(i,1)
                this.saveAttrVals(row)
            },
            // 将对attr_vals的操作保存到数据库
            async saveAttrVals(row){
                 // 发起请求 保存数据
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
                {
                    attr_name:row.attr_name,
                    attr_sel:row.attr_sel,
                    attr_vals:row.attr_vals.join(' ')
                })

                if(res.meta.status !== 200) return this.$message.error('修改参数项失败')
                this.$message.success('修改参数项成功')
            }
            
        
        },
        computed:{
            // 如果按钮需要被禁用 返回true 否则返回false
            isBtnDisabled(){
                if(this.selectedCateKeys.length !== 3){
                    return true
                } 
                return false
            },
            // 当前选中的三级分类的id
            cateId(){
                if(this.selectedCateKeys.length === 3){
                    return this.selectedCateKeys[2]
                }
                return null
            },
            // 动态计算标题文本
            titleText(){
                if(this.activeName === 'many'){
                    return '动态参数'
                }
                return '静态属性'
            }
        }
    }
</script>

<style scoped>
.cat_opt{
    margin: 15px 0;
}
.el-tag{
    margin: 10px;
}
.input-new-tag{
    width: 120px;
}
</style>